于2019年12月31日更新。
您不应使用Firebase云消息传递工具发送通知，因为它会迫使您使用标题和正文。
您必须发送不带标题和正文的通知。在后台运行该应用程序，它将为您工作。
如果它对您有用，请您对这个答案投我一票，谢谢。
我找到了一个临时解决方案。我不确定这是否是最佳解决方案，但是我的插件可以按预期工作，并且我认为问题必须出在第164行上的io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService提供的注册表中。
我的AndroidManifest.xml文件：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="Your Package"> // CHANGE THIS
<application
android:name=".Application"
android:label="" // YOUR NAME APP
android:icon="@mipmap/ic_launcher">
<activity
android:name=".MainActivity"
android:launchMode="singleTop"
android:theme="@style/LaunchTheme"
android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
android:hardwareAccelerated="true"
android:windowSoftInputMode="adjustResize">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
<!-- BEGIN: Firebase Cloud Messaging -->
<intent-filter>
<action android:name="FLUTTER_NOTIFICATION_CLICK" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
<!-- END: Firebase Cloud Messaging -->
</activity>
<meta-data
android:name="flutterEmbedding"
android:value="2" />
</application>
</manifest>
我的Application.java
package YOUR PACKAGE HERE;
import io.flutter.app.FlutterApplication;
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback;
import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService;
public class Application extends FlutterApplication implements PluginRegistrantCallback {
@Override
public void onCreate() {
super.onCreate();
FlutterFirebaseMessagingService.setPluginRegistrant(this);
}
@Override
public void registerWith(PluginRegistry registry) {
FirebaseCloudMessagingPluginRegistrant.registerWith(registry);
}
}
我的FirebaseCloudMessagingPluginRegistrant.java
package YOUR PACKAGE HERE;
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin;
public final class FirebaseCloudMessagingPluginRegistrant{
public static void registerWith(PluginRegistry registry) {
if (alreadyRegisteredWith(registry)) {
return;
}
FirebaseMessagingPlugin.registerWith(registry.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"));
}
private static boolean alreadyRegisteredWith(PluginRegistry registry) {
final String key = FirebaseCloudMessagingPluginRegistrant.class.getCanonicalName();
if (registry.hasPlugin(key)) {
return true;
}
registry.registrarFor(key);
return false;
}
}
用dart发送通知：
Future<void> sendNotificationOnBackground({
@required String token,
}) async {
await firebaseMessaging.requestNotificationPermissions(
const IosNotificationSettings(sound: true, badge: true, alert: true, provisional: false),
);
await Future.delayed(Duration(seconds: 5), () async {
await http.post(
'https://fcm.googleapis.com/fcm/send',
headers: <String, String>{
'Content-Type': 'application/json',
'Authorization': 'key=$SERVERTOKEN', // Constant string
},
body: jsonEncode(
<String, dynamic>{
'notification': <String, dynamic>{
},
'priority': 'high',
'data': <String, dynamic>{
'click_action': 'FLUTTER_NOTIFICATION_CLICK',
'id': '1',
'status': 'done',
'title': 'title from data',
'message': 'message from data'
},
'to': token
},
),
);
});
}
我添加了一个等待时间，持续时间为5秒，因此您可以将应用程序置于后台，并验证后台消息是否正在运行